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51.

Carbondioxide of the present atmosphere is entirely produced by:

A.	Forest fire	B.	Respiration of animals and plants
C.	Industrial smoke	D.	Microbial activity

52.

Miller synthesized simple amino acids from:

A.	Hydrogen, Ammonia, Methane and Water Vapours	B.	Ammonia, Methane, Cyanide and Oxygen
C.	Methane, Cyanide, Hydrogen and Oxygen	D.	Hydrogen, Oxygen Nitrogen and water

53.

Nucleoproteins most probably gave the first sign of:

A.	Life	B.	Evolution
C.	Matation	D.	Speciation

54.

Oxygen present in the atmosphere has been formed by:

A.	Evaporation of sea water	B.	Photosynthesis by plants
C.	Putrefaction of animals and plants	D.	Metabolism of micro-organisms

55.

It can be concluded on the basis of Miller's experiment that:

A.	Organic compounds contain hydrogen, oxygen and carbon	B.	Complex organic compound were first formed on the primitive earth
C.	Life originated in form of amino acid	D.	The organic compound can be synthesized in the laboratory

56.

Most important condition for the origin of life is presence of:

A.	Oxygen	B.	Nittogen
C.	Water	D.	Carbon

57.

Life originated about:

A.	One billion years ago	B.	Three billion years ago
C.	Six billion years ago	D.	Nine billion years ago

58.

Louis Pasteur is known for:

A.	Germ Theory of disease	B.	Germ Plasm Theory
C.	Recapitulation Theory	D.	Cell Theory

59.

Life originated:

A.	In air	B.	On land
C.	In water	D.	In all of these

60.

Which of the following must have evolved in the direction of "Origin of Life":

A.	Proteins and amino acids	B.	Proteins and nucleic acids
C.	Urea and proteins	D.	None of these